All of these can be defined under the keyboard shortcuts, under the “painting” category IIRC. However, I’d recommend using @EyeOdin Pigment.O plugin, at Pigment.O plugin - #425 by EyeOdin
and mapping keypresses there instead. This way you don’t have the issue where once you’ve increased lightness to white, you can’t walk back down to the same shade you were using before. With the Krita shortcuts that is a problem.
You can map different keys to “HSY 1 plus” , "HSY 2 minus " etc.
That probably needs some explanation. HSY 1 means the H component of HSY, so hue. HSY 2 is the S component, saturation and HSY 3 is the Y component, ee… not quite luminosity but something like that?. And plus or minus means decreasing or increasing that value.